its supposedly going to focus on how you get champions, a lot of other stuff is going to be changed around also, for example there wont be weapon stats like blunt and the like since people really don't pay much attention to those stats.
Its going to be $40 for the stand alone, $20 if you got FE on steam already.
The DLC is called Legendary Heroes, in addition to things being changed around with champions and weapon types n such theres going to be a "Huge" map size coming with the DLC, according to the site theres some confusion as to if the Huge map type will be playable for people with 32bit OS's, so it appears that 64bit/4GB+ of RAM may be a requirement when playing on that map type.
You can read about it and all the changes/additions here - forums.elementalgame.com/439970 - www.elementalgame.com/legendary-heroes
If you've purchased the original Elemental: War of Magic (IE, before the various patches as a founding member) you'll actually be receiving Fallen Enchantress: Legendary Heroes for free. Check your Stardock account for a CD Key on steam, and you'll have immediate access.
I was wondering if any work will be given to LH or are we going to sit with CE. Don't get me wrong CE works great, but the extension unlock doesn't seem to work with the steam url. I'd love to find a way to deal with exp for a particular hero.